Steam treatment method for piston products

A technology of water vapor treatment and water vapor, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as redness, impact, and unfavorable piston quality

Inactive Publication Date: 2012-12-19
GUANGDONG DONGMU NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the piston product is non-uniform, there will be local air leakage and redness during steam treatment, which will adversely affect the quality of the piston.

Method used

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  • Steam treatment method for piston products
  • Steam treatment method for piston products
  • Steam treatment method for piston products

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 Traditional method and the method of the present invention carry out the comparison of water vapor treatment to piston product

[0031] Utilize traditional method and the inventive method to carry out steam treatment to piston product:

[0032] Traditional method: Raise the temperature in the furnace and pass nitrogen to remove the water vapor, some oxygen and waste gas left over from the previous furnace, pass nitrogen for 0.8h and then pass water vapor for 0.5h. Then the piston product was reacted with water vapor at 540°C for 3h in the first stage treatment, and the piston product was reacted with water vapor at 580°C for 3h in the second stage treatment.

[0033] The method of the present invention: pretreatment is carried out according to the traditional method, and then the piston product is reacted with water vapor at 530° C. for 4 hours in the first stage treatment, and the piston product is reacted with water vapor at 580° C. for 2 hours in the s...

Embodiment 2

[0037] Embodiment 2 The further improvement of piston quality

[0038] Pistons also often show redness during the steam treatment process. In view of this phenomenon of the piston, the following measures are taken on the basis of the above method to further improve the quality of the piston product:

[0039] (1) Extend the time of nitrogen protection products

[0040] Under the condition that the nitrogen protection and the total time of passing water vapor before the first stage remain unchanged, shorten the time of passing water vapor before the first stage, so that the overall temperature of the product tends to be relatively uniform before reacting with water vapor. The temperature rises from the original 450°C to the current 500°C, and the nitrogen protection time increases from 0.5h to 1h.

[0041] (2) In each layer of ST basket, the screen plate separates the piston

[0042] The volume of the piston product is relatively small. If you put densely packed pistons in ...

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Abstract

The invention provides a steam treatment method for piston products. The steam treatment method includes pretreatment, first-stage treatment and second-stage treatment. The pretreatment includes filling steam after heating a furnace and filling nitrogen for a period of time. The method is characterized in that the piston products are subjected to react with the steam at the temperature ranging from 520 DEG C to 530 DEG C for 3.5 to 4.5 hours during the first-stage treatment; and the piston products are subjected to react with the steam at the temperature ranging from 580 DEG C to 590 DEG C for 1.5 to 2.5 hours during the second-stage treatment. By the method, the problem of gas leakage during steam treatment for the piston products can be solved. The invention further provides a method for improving the quality of the piston products.

Description

technical field [0001] The invention mainly relates to a steam treatment method, in particular to a steam treatment method for piston products. Background technique [0002] Steam treatment is usually used as the final production process of powder metallurgy products. Its main function is to seal the pores of powder metallurgy products. The surface of the processed products has a layer of blue-black substance, which is uniform and dense Fe. 3 o 4 . In addition, it also seals the pores inside the product. When the product needs to be machined, a layer of oxide on the surface is worn off, and its compactness is still intact. Pistons are axisymmetric, deep-bore cylindrical products with a thin top, and the thickness of the inner hole wall is usually inconsistent. Because the piston product is non-uniform, there will be local air leakage and redness during steam treatment, which will adversely affect the quality of the piston. [0003] The reaction of iron-based products wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/16
Inventor 朱沛庆李月朝梁集标
Owner GUANGDONG DONGMU NEW MATERIALS
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